The Optimization Of Gas-liquid Two-phase DBD Reactor And The Effect Of Dye Decolorization In The Reactor

The water treatment technology of gas-liquid two-phase dielectric barrier discharge (DBD) is a new advanced oxidation technology, that can produces high oxidation activity particles (such as· OH,· O3,· H,· O,· HO2,· O2, H2O2, etc.), UV radiation, high-energy electron bombardment, and many other factors synergies for highly toxic in the discharge process,and it has obvious advantages for treating the biodegradable organic wastewater. In recent years, the technology has become a hot topic of organic wastewater treatment.This article was first to carry out to optimize the reactor based on the original gas-liquid two-phase DBD reactor,then to study on the characteristics of the reactor discharge that has optimized and explore the optimal reaction conditions, and at the last, the reactor has been used for the decolorization of the Rhodamine B dye wastewater simulation under the optimal reaction conditions.The main work is as follows:(1) The original gas-liquid two-phase DBD reactor has been optimized to avoid the liquid droplets splashing into the media surface in the discharge process,and causing a short circuit and partial discharge phenomena,the reactor discharge is more stable;(2) Study on the effects of different peak voltage, frequency, and the discharge gap for the DBD discharge characteristics of gas-liquid two-phase reactor, and discusse the form of discharge in the gas-liquid two-phase DBD and gas DBD;(3) Measure the gas-liquid two-phase DBD Lissajous figures (Lissajous), analysis the form of discharge in the gas-liquid two-phase DBD,and the studying showed that:it is difficult to achieve the atmospheric pressure glow discharge;(4) Measure the emission spectrometry of the active species generated by the gas-liquid two-phase DBD, mainly nitrogen second positive band system (C3nuâ†'B3ng), and not found the spectra of the other elements in the experimental, also investigate the effect of peak voltage for the characteristic spectral intensity;(5) Study the effect of decolorization of Rhodamine B dye wastewater simulation under the optimal discharge conditions, the experimental results showed that:the gas-liquid two-phase DBD has a significant degradation effect for the Rhodamine B. In addition, study on the influence of different experimental conditions for the degradation rate of organic wastewater of gas-liquid two-phase DBD including peak voltage, initial pH, and the initial conductivity, the experimental results showed that: the peak voltage can greatly improve the degradation rate of Rhodamine B;the initial pH value of the solution couldn’t affected degradation rate,but,the degradation rate of Rhodamine B decrease with the initial conductivity of the solution increasing. In the experiment, set the discharge conditions is the peak voltage of20kV, discharge frequency of6.5kHz, the discharge gap of3mm, the initial concentration of100mg/L, initial pH of3.49,the initial conductivity of0.069mS· cm-1, after discharge60min, Rhodamine B removal rate up to95%.